My 2001 C5 has now gone scrap
Went for MOT:-
Faults are :-
Torsion suspension had snapped. (Yup you could he it clunk)
3 Ball joints knackered
Middle Hydraulic sphere underneath leaking fluid,
Exhaust needed replacing
Tyres needed replacing
Also back end wheels had done this " / - \ "
DPF, Kept popping up after a blast down the motorway every week.
So would like to say thank you to the members who advised me over the last 3 years with various minor faults.